Waterside Corrosion Of Zirconium Alloys In Nuclear Power Plants
XA9846730 IAEA-TECDOC-996 Waterside corrosion of zirconium alloys in nuclear power plants INTERNATIONAL ATOMIC EMEBOY AGENCY I) January 1998 \J, The IAEA does not normally maintain stocks of reports in this series However, microfiche copies of these reports can be obtained from INIS Clearinghouse International Atomic Energy Agency Wagramerstrasse P.O Box 100 A-1400 Vienna, Austria Orders should be accompanied by prepayment of Austrian Schillings 100, in the form of a cheque or in the form of IAEA microfiche service coupons which may be ordered separately from the INIS Clearinghouse The originating Section of this publication in the IAEA was: Nuclear Fuel Cycle and Materials Section International Atomic Energy Agency Wagramer Strasse P.O Box 100 A-1400 Vienna, Austria WATERSIDE CORROSION OF ZIRCONIUM ALLOYS IN NUCLEAR POWER PLANTS IAEA, VIENNA, 1998 IAEA-TECDOC-996 ISSN 1011-4289 ©IAEA, 1998 Printed by the IAEA in Austria January 1998 FOREWORD Technically the study of corrosion of zirconium alloys in nuclear power reactors is a very active field and both experimental work and understanding of the mechanisms involved are going through rapid changes As a result, the lifetime of any publication in this area is short Because of this it has been decided to revise IAEA-TECDOC-684 — Corrosion of Zirconium Alloys in Nuclear Power Plants — published in 1993 This updated, revised and enlarged version includes major changes to incorporate some of the comments received about the first version Since this review deals exclusively with the corrosion of zirconium and zirconium based alloys in water, and another separate publication is planned to deal with the fuel-side corrosion of zirconium based fuel cladding alloys, i.e stress corrosion cracking, it was decided to change the original title to Waterside Corrosion of Zirconium Alloys in Nuclear Power Plants The rapid changes in the field have again necessitated a cut-off date for incorporating new data This edition incorporates data up to the end of 1995; including results presented at the 11 International Symposium on Zirconium in the Nuclear Industry held in Garmisch-Partenkirchen, Germany, in September 1995 The IAEA wishes to express its thanks to all the authors, both of this updated review and of IAEA-TECDOC-684 on which it was based The IAEA staff member responsible for this publication was I.G Ritchie of the Division of Nuclear Power and the Fuel Cycle EDITORIAL NOTE In preparing this publication for press, staff of the IAEA have made up the pages from the original manuscripts as submitted by the authors The views expressed not necessarily reflect those of the IAEA, the governments of the nominating Member States or the nominating organizations Throughout the text names of Member States are retained as they were when the text was compiled The use of particular designations of countries or territories does not imply any judgement by the publisher, the IAEA, as to the legal status of such countries or territories, of their authorities and institutions or of the delimitation of their boundaries The mention of names of specific companies or products (whether or not indicated as registered) does not imply any intention to infringe proprietary rights, nor should it be construed as an endorsement or recommendation on the part of the IAEA CONTENTS INTRODUCTION METALLURGY OF ZIRCONIUM ALLOYS 2.1 Processing 2.2 Microstructure 2.2.1 Pure zirconium 2.2.2 Alloys and alloying elements 2.3 Heat treatments and resultant microstructure 2.4 Deformation and texture OXIDATION THEORY 3.1 3.2 3.3 3.4 Microcryistalline nature of the oxide Electrical resistivity of zirconia Effects of electric fields on the oxidation kinetics Effect of impurities and alloying elements CORROSIUM IN THE ABSENCE OF IRRADIATION 4.1 Introduction 4.2 Uniform oxide formation 4.2.1 Oxidation kinetics 4.2.2 Pre-transition oxidation mechanism 4.2.3 Mechanism of oxide breakdown on the Zircaloys 4.2.4 Mechanism of oxide breakdown in Zr-Nb alloys 4.2.5 Post-transition growth 4.3 Non-uniform (nodular) oxide formation 4.3.1 Nodular oxide formation 4.3.2 Mechanism of nodule formation 4.3.3 Simulating nodular corrosion in high temperature water HYDROGEN ABSORPTION 5.1 Hydrogen absorption mechanism 5.1.1 Hydrogen uptake during corrosion 5.1.2 Absorption of hydrogen gas 5.1.3 Hydrogen absorption via metallic contacts 5.1.4 Hydrogen uptake during cathodic polarisation 5.2 Effects of hydrogen content on oxidation 11 11 12 12 12 19 23 27 28 29 29 34 37 37 37 40 57 67 78 78 84 85 88 90 91 91 92 104 Ill 114 116 FACTORS AFFECTING THE CORROSION OF ZIRCONIUM ALLOYS IN REACTORS 124 6.1 Alloy compositions for nuclear applications 6.1.1 Alloy types 6.1.2 Alloy development programmes 124 124 126 6.2 Metallurgical variables 6.2.1 Precipitate size 6.2.2 Influence of quenching conditions 6.2.3 Influence of final annealing 6.2.4 Influence of cold work and deformation sequence 6.2.5 Initiation of nodular corrosion in BWR materials 6.2.6 Effect of metallurgical conditions on the corrosion of Zr-Nb alloys 6.3 Surface conditions 6.4 Coolant chemistry 6.4.1 PWR chemistry 6.4.2 BWR chemistry 6.4.3 WWER chemistry 6.4.4 PHWR (CANDU) chemistry 6.5 Effect of temperature 6.5.1 High temperature oxidation of Zircaloy alloys 6.5.2 High temperature oxidation of Zr-l%Nb alloys 6.6 Effect of heat flux MODELLING OF IN-REACTOR CORROSION OF ZIRCONIUM ALLOY FUEL CLADDING 7.1 Introduction 7.2 Calculation of oxide-metal interface temperatures 7.2.1 Single phase coolants 7.2.2 Two phase coolants 7.2.3 Oxide thermal conductivity 7.3 Semi-empirical models for Zircaloy corrosion in PWRs 7.3.1 Generic formulation for semi-empirical models 7.3.2 Individual models of simple generic form 7.3.3 Individual models incorporating additional effects 7.4 Mechanistic models 7.4.1 Cox's model 7.4.2 Russian models for Zr-l%Nb cladding 7.5 Summary of PWR corrosion modelling IRRADIATION EFFECTS ON CORROSION 8.1 Irradiation damage 8.1.1 Fast neutron damage in the metals 8.1.2 Displacement damage in other structures 8.1.3 Effect of irradiation on microstructures 8.2 Radiation chemistry 8.2.1 Radiolysis in the bulk water 8.2.2 Radiolysis near metal surfaces or in the pores surrounded by metal oxides 8.2.3 "Thick oxide film effects" 8.2.4 Localised corrosion and dissimilar metals 8.3 Crud deposition and heat transfer effects 8.3.1 PWR crud deposition 136 136 145 145 150 150 150 152 154 155 161 162 164 164 165 165 165 170 170 171 171 173 174 175 178 179 188 189 189 191 195 198 198 198 199 203 212 212 218 221 224 225 225 8.3.2 WWER crud deposition 8.3.3 BWR crud deposition 8.4 Metallurgical and chemical variables 8.4.1 Behaviour of alloying additions 8.4.2 Electrochemical effects 8.5 Corrosion of Zr-l%Nb cladding PRESENT STATUS OF THE MECHANISTIC UNDERSTANDING 9.1 Current understanding of the out-reactor oxidation mechanism 9.1.1 Mobile species 9.1.2 Evolution of oxide morphology 9.1.3 The development and nature of oxide porosity 9.1.4 Oxide barrier layers 9.1.5 Effect of some variables on the oxide structure 9.2 Empirical correlations of effects of irradiation 9.2.1 Development of irradiation corrosion mechanisms 9.2.2 Open questions on micromechanisms for in-reactor corrosion 9.2.3 Present status of mechanistic studies 9.2.4 Recommendations for future work 236 236 238 238 239 242 249 249 249 250 256 261 264 265 266 277 278 278 APPENDIX 279 REFERENCES 281 BIBLIOGRAPHY 311 LIST OF CONTRIBUTORS 313 NEXT PAGE(S) left BLANK INTRODUCTION The original version of this TECDOC [1] was written at a time when major programmes on fuel cladding improvement were under way in most countries with active nuclear power programmes, but few of the results of these programmes had been published The references on which this first version was based were cut off essentially prior to the Portland IAEA Conference [2], whose Proceedings were not then available, and the Kobe Zirconium Conference [3] respectively in September 1989 and November 1990, although a few references to these meetings were subsequently added The contents of this version, therefore, rapidly became dated The original version had been targeted at the relatively limited audience of those professionals actively working on some aspect of the research and development of corrosion resistant zirconium alloys, but in practice a large fraction of the demand came from those involved in the nuclear fuel cycle at the utility level This has been taken into account in the new version Zirconium alloys continue to be the major structural materials employed within the fuelled region of all water cooled nuclear power reactors Thus, they are invariably used as fuel cladding, fuel channels (boxes, wrappers), pressure tubes and calandria tubes and often as fuel spacer grids Other structural metals appear in this region of the reactor core mainly as minor components such as grid springs and garter springs (spacers between pressure and calandria tubes in CANDUs) The performance of zirconium alloys in service has been generally satisfactory, although the pressures to achieve higher fuel burnups and higher reactor thermal efficiencies have pushed the historically used alloys to the limits of their capabilities Evidence that these limits were being reached was the primary driving force for the major new alloy development programmes already mentioned A further driving force has been the acknowledgement that debris fretting had become the primary cause of fuel failures, and that primary failures from this cause could lead to unexpectedly severe secondary failures, especially for zirconium barrier cladding developed to protect against pellet-cladding interaction (stress-corrosion cracking) failures as a primary defect mechanism In PWRs, therefore, there is a general desire to reduce oxidation rates in order to achieve higher fuel burnup and rating However, because of the temperature feedback loop (section 3.) at the end of life, the corrosion rate (and the associated hydrogen uptake rate) accelerates rapidly Other factors may also increase the corrosion rate under these conditions, including the precipitation of hydrides (section 2.), dissolution of precipitates and the concentration of lithium hydroxide There is a need to understand the potential effects of concentrating lithium hydroxide under these conditions because they are linked to the ability to reduce circuit activation, and hence personnel radiation exposures, that could result from the use of increased LiOH concentrations In BWRs, the infrequent secondary degradation failures that led to serious operational consequences as a result of rapid increases in off-gas radiation levels, are also the target of a major research and development effort, pquenched cladding amongst other changes has eliminated serious episodes of nodular corrosion induced (Crud Induced Localised Corrosion-CILC) failures, but a reduction in end-of-life uniform oxide thickness is still a desirable objective As in any system where the consequences of minor changes in materials or operating conditions can have major impacts on the economics of the system if they lead to forced outages, it is vitally important that the consequences of any changes be thoroughly explored and understood Decisions on whether to make operational changes (e.g increased Li) can often be beset with conflicting requirements which have to be balanced before a decision can be made It is hoped that this review will provide sufficient background and information on the factors controlling zirconium alloy corrosion and hydrogen uptake in-reactor to permit such decisions to be made on a sound basis The revised format of the review now includes: • • Introductory chapters on basic zirconium metallurgy and oxidation theory; A revised chapter discussing the present extent of our knowledge of the corrosion mechanism based on laboratory experiments; • • • • • A separate and revised chapter discussing hydrogen uptake; A completely reorganised chapter summarising the phenomenological observations of zirconium alloy corrosion in reactors; A new chapter on modelling in-reactor corrosion; A revised chapter devoted exclusively to the manner in which irradiation might influence the corrosion process; Finally, a summary of our present understanding of the corrosion mechanisms operating in reactor Although much new information has become available in the last five years, there are still blocks of data that have not been linked together in an understandable manner Thus, much of the early corrosion data was obtained from non-heat transfer specimens in in-reactor loops, whereas virtually all of the recent in-reactor data comes from high heat flux fuel cladding Only minor amounts of recent data come from non-heat transfer surfaces such as oxide thicknesses on plena, spacer grids, pressure tubes, water rods or guide tubes As a result, it remains difficult to extrapolate conclusions drawn from the early loop tests to the behaviour of current fuel cladding or pressure tubes Great strides have been made recently in delineating the impact of variations in fabrication route and of careful control of impurity and alloying additions on the in-reactor behaviour of fuelcladding As a result most fuel vendors have moved to some version of "optimised" Zircaloy cladding, as precursor to the introduction of new cladding alloys lying outside the range of the Zircaloy specifications The introduction of such new alloys has been greatly facilitated by the demonstration of both the production and satisfactory performance of duplex cladding tubes These are in the form of duplex tubes ~90% of the wall thickness of which is standard Zircaloy-4, with the outer -10% of the tube made of the new alloy This requires similar technology to that which puts unalloyed (or low alloyed) zirconium barriers on the inside of fuel cladding tubes for BWR applications The advantage of this duplex tube technology is that alloys that could not be considered for fuel cladding use in a monotube form, because of inadequate, or inadequately known, mechanical properties, can be introduced in the form of duplex tubes with minimal regulatory limitations Another area where major changes have been apparent since the original review was written is in the availability of much evidence on the behaviour of Zr-l%Nb cladding in KOH/ammonia or hydrazine water chemistries typical of Russian designed reactors This information has been incorporated wherever possible to provide a comparison with the observations on Zircaloy-4 in LiOH water chemistry The low oxide thicknesses still present on Zr-l%Nb cladding after high burnup in KOH/ammonia water chemistry (where thermal hydraulic conditions have been comparable to those in a high temperature PWR, i.e TMt>345°C with sub-channel boiling) call for some comparative testing of Zircaloy-4 under these conditions so that any contribution of LiOH to current in-reactor 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Vienna (1997) INTERNATIONAL ATOMIC ENERGY AGENCY, Thermophysical Properties of Materials for Water Cooled Reactors, IAEA-TECDOC-949, IAEA, Vienna (1997) 312 LIST OF CONTRIBUTORS CONTRIBUTORS TO DRAFTING AND REVIEW Cox, B University of Toronto, Canada Kritsky, V.G VNIPIET, St Petersburg, Russian Federation Lemaignan, C Commissariat a l'energie atomique, Grenoble France Polley, V Nuclear Electric pic, Barnwood, United Kingdom Ritchie, I.G International Atomic Energy Agency Ruhmann, H Siemens AG, Erlangen, Germany Shishov, V.N' VNIINM Research Institute of Inorganic Materials, Moscow, Russian Federation Other authors who contributed to the VNIINM part of the review were: Bibilashvili, Yu.K and Nikulina, A.V CONTRIBUTORS TO DRAFTING AND REVIEW OF IAEA-TECDOC-684 Billot, P Commissariat a l'energie atomique, Cadarache France Cox, B University of Toronto, Canada Ishigure, K University of Tokyo, Japan Johnson Jr A.B Battelle, Pacific Northwest Laboratories, USA Lemaignan, C Commissariat a I'energie atomique, Grenoble, France Nechaev, A.F International Atomic Energy Agency Petrik, N.G All-Union Institute of Complex Power Technology, Russian Federation Reznichenko, E.A Kharkov Institute of Technology, Ukraine Ritchie, I.G International Atomic Energy Agency Sukhanov, G.I International Atomic Energy Agency 313 ... fuel-side corrosion of zirconium based fuel cladding alloys, i.e stress corrosion cracking, it was decided to change the original title to Waterside Corrosion of Zirconium Alloys in Nuclear Power Plants. .. Precipitate size 6.2.2 Influence of quenching conditions 6.2.3 Influence of final annealing 6.2.4 Influence of cold work and deformation sequence 6.2.5 Initiation of nodular corrosion in BWR materials... prepayment of Austrian Schillings 100, in the form of a cheque or in the form of IAEA microfiche service coupons which may be ordered separately from the INIS Clearinghouse The originating Section of